JP4195919B2 - Copper converter operation method - Google Patents
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- JP4195919B2 JP4195919B2 JP2000237531A JP2000237531A JP4195919B2 JP 4195919 B2 JP4195919 B2 JP 4195919B2 JP 2000237531 A JP2000237531 A JP 2000237531A JP 2000237531 A JP2000237531 A JP 2000237531A JP 4195919 B2 JP4195919 B2 JP 4195919B2
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Description
【０００１】
【発明の属する技術分野】
本発明は，白カワ中に随伴するＰｂ，ＡｓおよびＳｂ等の不純物を効率よく分離回収する銅の転炉操業法に関する。
【０００２】
【従来の技術】
硫化物主体の銅の転炉操業法では，カワ中のＦｅＳの酸化と造カンを主とする造カン期と，この造カン期で生成した白カワ（主としてＣｕ2Ｓ）から金属銅に酸化脱硫する造銅期とからなるが，いずれも酸素含有ガスを羽口から吹き込む吹錬によって行われる。
【０００３】
転炉に入る不純物は，多くのものは吹精中に揮発あるいは酸化されるが，一部は粗銅中に残る。このような不純物の分離除去並びに回収を効率よく行うことも転炉操業の重要な課題であり，従来より種々の対策が採られている。
【０００４】
例えば特開２０００−６３９６３号公報には，スラグ組成を調整することによって，具体的にはＣａＯ／（ＳｉＯ2＋ＣａＯ）：０．３〜０．５，Ｆｅ／（ＦｅＯ＋ＳｉＯ2＋ＣａＯ）：０．２〜０．５のスラグが得られるようにＳｉＯ2源およびＣａＯ源を加えて造カン期および造銅期の吹錬を行い，Ｐｂ，Ａｓ，Ｓｂ等をスラグ側に移行させる方法が提案されている。
【０００５】
また，特開２０００−８７１５３号公報には，造銅期末期の仕上げ期に，ＣａＯを構成要素とする粉体を羽口を介して吹き込むことによって高融点の造銅期カラミを生成させる方法が記載されている。この方法によると高融点のカラミは粗銅排出後の転炉内で凝固しやすいので，次回カワ装入時のカワとの反応が抑制され，その結果，Ｐｂ，Ｚｎ，Ｃｄ，Ａｓ等を含むヒュームの発生を低減できるとされている。
【０００６】
【発明が解決しようとする課題】
造カン期ではカワ中のＦｅＳの酸化と造カンを主とする吹錬を実施し，造銅期では白カワから金属銅に酸化脱硫する吹錬を実施するのが銅転炉の本来の使命である。この吹錬中に，特開２０００−６３９６３号公報に提案されたような不純物の除去対策も併せて実現することが望ましいが，このために前記の本来の使命まで犠牲にすることは余り得策ではない。したがって，溶銅中にＰｂ，ＡｓおよびＳｂがある程度共存する状態で造銅期を終え，この溶銅中からこれら不純物を除去回収する方が有利なときもある。
【０００７】
本発明の課題は，造銅期を終えた転炉内の溶銅中からこれら不純物を効率良く回収する方法を提供することにある。
【０００８】
【課題を解決するための手段】
本発明によれば，造銅期が終了した後，さらに羽口より酸素含有ガスを吹き込んで溶銅の一部を酸化するオーバーブローイングを行う銅の転炉操業において，造銅期末期に転炉装入口よりＳｉＯ2を主成分とするフラックスを投入してから造銅期を終了し，引き続き該オーバーブローイングを行うことを特徴とする銅の転炉操業法を提供するものである。
【０００９】
そのさい，転炉装入口より装入されたＳｉＯ2を主成分とするフラックスを造銅期終了前（オーバーブローイング前）に融解させておくのが好ましい。また，造カン期終了時の白カワ中のＰｂ，ＡｓおよびＳｂの含有量を検出しておき，これらの検出値と転炉に装入されたカワ量とからオーバーブローイング時の吹き込み酸素量を決定することにより，過不足なくオーバーブローイングを実施できる。
【００１０】
本発明に従うオーバーブローイングは，Ｐｂリッチのスラグを形成する一次オーバーブローイングと，Ａｓ・Ｓｂリッチのスラグを形成する二次オーバーブローイングとからなる。一次オーバーブローイングではＳｉＯ2リッチのスラグの共存下で実施し，二次オーバーブローイングにおいては，好ましくは一次オーバーブローイングで生成したスラグを排滓してから，羽口から吹き込む酸素含有ガスにカルシウム化合物の粉体を同伴させる粉体インジェクションブローを実施する。
【００１１】
【発明の実施の形態】
本明細書において，造銅期を終了した転炉内溶銅を対象として羽口から酸素含有ガスを吹き込む吹錬を「オーバーブローイング」と呼ぶ。酸素含有ガスとして酸素富化空気や熱風等も使用可能であるが，常温の空気が最も簡便である。このオーバーブローイングでは銅の酸化損が発生することになるが，溶銅中の不純物も併せて酸化除去することが可能である。オーバーブローイングにおける銅の酸化損と不純物酸化の利害得失を考える場合，不純物の除去効率，スラグの有効活用，オーバーブローイングの終点制御，フラックス添加量制御等がその成否を分けることになる。
【００１２】
本発明者らは，このような観点に立って，オーバーブローイングの最も効率のよい操業を完成すべく努力してきたが，オーバーブローイングを主としてＰｂを除去するブローと，主としてＡｓおよびＳｂを除去するブローに分割し，前者を終えたあとに，後者を実施し，そして，各々のブローは異なる条件を採用することが有利であることを知った。
【００１３】
先ず，造銅期終了後にＰｂ除去を主とする一次オーバーブローイングを実施する。ここでＰｂを酸化してスラグに移行させるには，ＳｉＯ2系のスラグを共存させるのが有利である。しかし，このためにＳｉＯ2系のフラックスを装入すると，その溶融のための熱源が銅の酸化熱で賄われることになるので得策ではない。そこで造銅期末期にＳｉＯ2を主成分とするフラックスを転炉装入口から装入し，造銅期末期に存在している白カワの反応熱をこのフラックスの融解に利用する。すなわち造銅期の仕上げ吹錬時のこのフラックスを融解し，造銅期終了時には，このＳｉＯ2系フラックスがほぼ完全に融解しているように，フラックス量とその装入時期を選定する。
【００１４】
このフラックスの装入時期については，実際には転炉排ガス中のＳＯ2濃度が４％以下になったところとし，その装入量については白カワ中に存在したＰｂ量に応じた量に選定する（該Ｐｂ量に係数を乗じてフラックス量を計算する）。白カワ中のＰｂ量は，転炉へのカワ装入量と，造カン期終了時の白カワ中のＰｂ量のオンライン分析値から決定できる。
【００１５】
ＳｉＯ2系フラックスが融解した状態で一次オーバーブローイングを行うのであるが，この吹錬時間は，前記のＰｂ含有量を基にして算出する。すなわちＰｂの全量を酸化するに十分な酸素が供給される環境設定から，該Ｐｂ含有量に係数を乗じることによって求めることができる。
【００１６】
ＳｉＯ2含有スラグ共存下での一次オーバーブローイングによって，Ｃｕ2Ｏ−マグネタイト−ＳｉＯ2系スラグ中にＰｂＯが含まれたＰｂリッチのスラグが生成する。このスラグを二次オーバーブローイングの前に排滓するのが好ましい。このスラグは次回以降の転炉操業の造カン期に戻してスラグ中の銅を回収するのが望ましい。そのさいＰｂＯの大部分はカラミ中に止まるので，カラミとして炉外に排出される。一次オーバーブローイングによって溶銅中のＡｓおよびＳｂの一部もこのスラグに入るが，一次オーバーブローイングはＰｂの除去を主目的としており，Ｐｂの除去がほぼ完了した時点で一次オーバーブローイングを一応終了させ，ＡｓおよびＳｂの低域までの除去は次の二次オーバーブローイングで実施する。
【００１７】
二次オーバーブローイングは，羽口からのＣａＯ源の粉体吹込みによって実施する。すなわち，羽口から吹込む酸素含有ガス（空気）にＣａＯ源粉体を同伴させ，溶銅中にＣａＯ源をインジェクションする。ＣａＯ源としては石灰，石灰岩粉，炭カル等が使用できるが，炭カルの使用が好都合である。消石灰も用いて見たが，炭酸カルシウムの方が除去効果が高いことがわかった。
【００１８】
羽口から空気と共にＣａＯ源を溶銅中にインジェクションすると，溶銅中のＡｓ，ＳｂおよびＰｂはいずれもＣａＯと反応して反応生成物としてのスラグを形成し，溶銅中の含有量は極低域まで減少する。このＣａＯ源のインジェクション量並びにブロー時間についても，白カワ中のＰｂ，ＡｓおよびＳｂ量についてのオンライン検出値と，転炉へのカワ装入量を基に算出し，この算出値に基づいて制御する。
【００１９】
このようにして本発明によると，カワに同伴するＰｂ，ＡｓおよびＳｂの実質的な除去を２段階に分けたオーバーブローイングによって実施するので，造カン期および造銅期における本来の銅製錬の操業に負荷を与えることなく，低域まで不純物が除去された溶銅を操業性良く製造できるようになり，高品位の銅電解精製用粗銅を効率良く得ることができる。
【００２０】
【実施例】
〔実施例１〕
内径３.５ｍで長さ８.２ｍの１００ｔｐｓ転炉に，自溶炉で製造されたカワ１２０ｔを受け入れて吹錬した後，造カン期を終了した。この時得られた白カワのＰｂ，ＡｓおよびＳｂ品位はオンライン計測でＰｂ＝3.0 ％, Ａｓ＝0.4 ％, Ｓｂ＝0.9 ％であり，白カワの推定量は 104ｔであった。これらのデータから，造銅期末期に装入するＳｉＯ2を主成分とするフラックス (珪石を使用) の必要装入量は 759Ｋｇと算出され，二次オーバーブローイングでインジェクションするカルシウム化合物 (炭酸カルシウムを使用) の必要インジェクション量は 1443 Ｋｇと算出された。また，一次オーバーブローイング時間は 360 Nm3×21カウント (時間単位) であると算出された。
【００２１】
前記の算出結果に基づいて, 造銅期末期 (排ガス中のＳＯ2濃度が４％になった時) に，珪石 759Ｋｇを転炉装入口から装入し，ほぼ同時に羽口から 360 Nm3×21カウントの送風を行って一次オーバーブローイングを実施し，排滓した。次いで，羽口から炭酸カルシウムを 1443 Ｋｇインジェクションするオーバーブローイングを行ない，吹錬を終了した。得られた粗銅の品位は，Ｐｂ＝0.30％, Ａｓ＝0.12％, Ｓｂ＝0.14％であった。この操業結果を表１に示した。
【００２２】
〔実施例２〕
自溶炉で製造されたカワ１１５ｔを受け入れて実施例１と同様に吹錬した後，造カン期を終了した。その時点での白カワのＰｂ，ＡｓおよびＳｂ品位はＰｂ＝4.0 ％, Ａｓ＝0.3 ％, Ｓｂ＝0.6 ％であり, 白カワの推定量は１０６ｔであった。これらのデータから，造銅期末期に装入する珪石の必要装入量は 815Ｋｇと算出され，二次オーバーブローイングでの炭酸カルシウムの必要インジェクション量は 1026 Ｋｇと算出された。また，一次オーバーブローイング時間は 360 Nm3×23カウント (時間単位) であると算出された。
【００２３】
前記の算出結果に基づいて, 造銅期末期 (排ガス中のＳＯ2濃度が４％になった時) に，珪石 815Ｋｇを転炉装入口から装入し，ほぼ同時に羽口から 360 Nm3×23カウントの送風を行って一次オーバーブローイングを実施し，排滓した。次いで，羽口から送風を行いつつ炭酸カルシウムを 1026 Ｋｇインジェクションする二次オーバーブローイングを行ない，吹錬を終了した。得られた粗銅の品位は，Ｐｂ＝0.11％, Ａｓ＝0.09％, Ｓｂ＝0.10％であった。この操業結果も表１に併記した。
【００２４】
〔実施例３〕
自溶炉で製造されたカワ１４０ｔを受け入れて実施例１と同様に吹錬した後，造カン期を終了した。その時点での白カワのＰｂ，ＡｓおよびＳｂ品位はＰｂ＝2.0 ％, Ａｓ＝0.2 ％, Ｓｂ＝0.4 ％であり, 白カワの推定量は１１７ｔであった。これらのデータから，造銅期末期に装入する珪石の必要装入量は 504Ｋｇと算出され，二次オーバーブローイングでの炭酸カルシウムの必要インジェクション量は 666Ｋｇと算出された。また，一次オーバーブローイング時間は 360 Nm3×15カウント (時間単位) であると算出された。
【００２５】
前記の算出結果に基づいて, 造銅期末期 (排ガス中のＳＯ2濃度が４％になった時) に，珪石 504Ｋｇを転炉装入口から装入し，ほぼ同時に羽口から 360 Nm3×15カウントの送風を行って一次オーバーブローイングを実施し，排滓した。次いで，羽口から送風を行いつつ炭酸カルシウムを 666Ｋｇインジェクションする二次オーバーブローイングを行ない，吹錬を終了した。得られた粗銅の品位は，Ｐｂ＝0.29％, Ａｓ＝0.12％, Ｓｂ＝0.14％であった。この操業結果も表１に併記した。
【００２６】
〔比較例〕
自溶炉で製造されたカワ１１7 ｔを受け入れて実施例１と同様に吹錬した後，造カン期を終了した。その時点での白カワのＰｂ，ＡｓおよびＳｂ品位はＰｂ＝2.5 ％, Ａｓ＝0.35％, Ｓｂ＝0.65％であった。造銅期末期に珪石を装入することなく造銅期を終了し，引き続き, 360 Nm3 ×40カウントのオーバーブローイングを行ない, 炭酸カルシウムのインジェクションも行うことなく，吹錬を終了した。得られた粗銅の品位は，Ｐｂ＝0.25％, Ａｓ＝0.13％, Ｓｂ＝0.15％であった。
【００２７】
【表１】
表１の結果に見られように，比較例では，実施例１〜３のほぼ２〜３倍の負荷をかけてオーバーブローイングを実施したにも拘わらず（それだけ，スラグに移行する酸化銅の量が多くなっている），それほど不純物が除去されていない。これに対し各実施例では，不純物の含有量に応じて過不足なくオーバーブローイングが実施された結果，粗銅管理値を十分に満足する高品位の粗銅を効率よく製造することができたことがわかる。
【００２９】
【発明の効果】
以上説明したように，本発明によると，銅の電解精製に悪影響を与えるＰｂ，ＡｓおよびＳｂを，転炉操業時に効率よく除去できるようになり，硫化鉱を原料とする銅製錬の合理化に大きく貢献できる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a copper converter operating method for efficiently separating and recovering impurities such as Pb, As and Sb accompanying white river.
[0002]
[Prior art]
In the sulfide-based copper converter operation method, oxidation of FeS in the river and the formation period mainly consisting of cans, and the white river (mainly Cu 2 S) produced during the formation period are oxidized to copper metal It consists of the copper making stage to desulfurize, but all are performed by blowing oxygen-containing gas from the tuyere.
[0003]
Most of the impurities entering the converter are volatilized or oxidized during blowing, but some remain in the crude copper. Efficiently separating and recovering such impurities is an important issue in converter operation, and various measures have been taken conventionally.
[0004]
For example, in Japanese Patent Laid-Open No. 2000-63963, by adjusting the slag composition, specifically, CaO / (SiO 2 + CaO): 0.3 to 0.5, Fe / (FeO + SiO 2 + CaO): 0.2 the SiO 2 source and CaO source added as slag to 0.5 is obtained performs blowing of forming cans phase and Zodo-life, Pb, as, Sb, etc. has been proposed a method to shift to the slag side Yes.
[0005]
Japanese Patent Application Laid-Open No. 2000-87153 discloses a method for producing a high melting point copper-making calami by blowing a powder containing CaO through a tuyere at the finishing stage of the copper-making final stage. Are listed. According to this method, the high melting point calami is easily solidified in the converter after discharging the crude copper, so that the reaction with the river at the next charging of the river is suppressed. As a result, fume containing Pb, Zn, Cd, As, etc. It is said that the occurrence of this can be reduced.
[0006]
[Problems to be solved by the invention]
The original mission of a copper converter is to perform oxidation and desulfurization from white river to metal copper during the copper making stage, while performing oxidation and smelting mainly of FeS in the river during the copper making stage. It is. During this blowing, it is desirable to implement measures for removing impurities as proposed in Japanese Patent Application Laid-Open No. 2000-63963, but for this purpose, it is not a good idea to sacrifice the original mission. Absent. Therefore, it may be advantageous to finish the copper making process in a state where Pb, As and Sb coexist to some extent in the molten copper, and to remove and recover these impurities from the molten copper.
[0007]
An object of the present invention is to provide a method for efficiently recovering these impurities from molten copper in a converter after the copper making period.
[0008]
[Means for Solving the Problems]
According to the present invention, after the completion of the copper making period, in the copper converter operation in which oxygen-containing gas is further blown from the tuyere to oxidize part of the molten copper, The present invention provides a copper converter operating method characterized in that a flux containing SiO 2 as a main component is introduced from an inlet, the copper making period is terminated, and the overblowing is subsequently performed.
[0009]
At that time, it is preferable to melt the flux mainly composed of SiO 2 charged from the converter charging inlet before the end of the copper making period (before overblowing). Also, the contents of Pb, As and Sb in the white river at the end of the canning period are detected, and the amount of oxygen blown during overblowing is determined from these detected values and the amount of river charged in the converter. By deciding, overblowing can be implemented without excess or deficiency.
[0010]
The overblowing according to the present invention includes a primary overblowing that forms a Pb-rich slag and a secondary overblowing that forms an As · Sb-rich slag. The primary overblowing is performed in the presence of SiO 2 rich slag, and in the secondary overblowing, the slag generated by the primary overblowing is preferably discharged, and then the oxygen-containing gas blown from the tuyere is filled with calcium compounds. Implement powder injection blow with powder.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the present specification, blowing that oxygen-containing gas is blown from the tuyere for the molten copper in the converter after the copper making period is called “overblowing”. Although oxygen-enriched air or hot air can be used as the oxygen-containing gas, room temperature air is the simplest. This overblowing causes oxidation loss of copper, but impurities in the molten copper can also be removed by oxidation. When considering the advantages and disadvantages of copper oxidation loss and impurity oxidation in overblowing, the efficiency of impurity removal, effective utilization of slag, end point control of overblowing, control of the amount of flux added, and the like are divided.
[0012]
From the above viewpoint, the present inventors have made efforts to complete the most efficient operation of overblowing. However, overblowing mainly removes Pb and blow mainly removes As and Sb. After finishing the former, the latter was implemented, and we learned that it was advantageous for each blow to adopt different conditions.
[0013]
First, after the copper making period is completed, primary overblowing mainly for Pb removal is performed. Here, in order to oxidize Pb and transfer it to slag, it is advantageous to coexist SiO 2 slag. However, if SiO 2 flux is introduced for this purpose, the heat source for melting is covered by the oxidation heat of copper, which is not a good idea. Therefore, a flux containing SiO 2 as the main component is charged from the converter inlet at the end of copper making, and the reaction heat of white river existing at the end of copper making is used for melting this flux. In other words, the flux amount and the charging time are selected so that the flux at the finish blowing in the copper making stage is melted, and at the end of the copper making stage, the SiO 2 flux is almost completely melted.
[0014]
Regarding the charging time of this flux, the SO 2 concentration in the converter exhaust gas was actually 4% or less, and the charging amount was selected according to the amount of Pb present in the white river. (The amount of flux is calculated by multiplying the amount of Pb by a coefficient). The amount of Pb in white river can be determined from the amount of river charged into the converter and the on-line analysis value of the amount of Pb in white river at the end of the canning period.
[0015]
The primary overblowing is performed with the SiO 2 flux melted, and the blowing time is calculated based on the Pb content. That is, it can be determined by multiplying the Pb content by a factor from the environmental setting in which sufficient oxygen is supplied to oxidize the entire amount of Pb.
[0016]
By the primary over-blowing in SiO 2 containing slag presence, PbO is Pb-rich slag that contains generated on Cu 2 O-magnetite -SiO 2 system in the slag. This slag is preferably rejected prior to secondary overblowing. It is desirable to return this slag to the canning stage of the subsequent converter operation and recover the copper in the slag. At that time, most of the PbO stays in the calami and is discharged out of the furnace as calami. Although part of As and Sb in molten copper also enters this slag by primary overblowing, primary overblowing is mainly aimed at removing Pb, and once primary Pb removal is almost complete, the primary overblowing is temporarily stopped. , As and Sb are removed to the low frequency by the following secondary overblowing.
[0017]
Secondary overblowing is performed by blowing powder of CaO source from the tuyere. That is, the CaO source powder is entrained in an oxygen-containing gas (air) blown from the tuyere and the CaO source is injected into the molten copper. As the CaO source, lime, limestone powder, charcoal cal or the like can be used, but use of charcoal calf is convenient. Although it was seen using slaked lime, it was found that calcium carbonate had a higher removal effect.
[0018]
When CaO source is injected into the molten copper together with air from the tuyere, As, Sb and Pb in the molten copper all react with CaO to form slag as a reaction product, and the content in the molten copper is extremely high. Decrease to low range. The CaO source injection amount and blow time are also calculated based on the on-line detection values for the Pb, As and Sb amounts in the white river and the amount of river charge in the converter, and controlled based on the calculated values. To do.
[0019]
Thus, according to the present invention, the substantial removal of Pb, As and Sb accompanying the river is carried out by overblowing divided into two stages, so that the original copper smelting operation in the canning and coppermaking stages In this way, it is possible to manufacture molten copper from which impurities have been removed to a low range with good operability without burdening the steel, and high-quality crude copper for electrolytic electrolytic refining can be obtained efficiently.
[0020]
【Example】
[Example 1]
The can-making period was completed after receiving 120 t of river produced in a flash furnace and blowing it into a 100 tps converter with an inner diameter of 3.5 m and a length of 8.2 m. The Pb, As and Sb grades of the white river obtained at this time were Pb = 3.0%, As = 0.4%, Sb = 0.9% as measured online, and the estimated amount of white river was 104t. These data necessary charging amount of flux (using silica) mainly composed of SiO 2 that is charged to the granulation of copper-life end was calculated to 759Kg, calcium compound is injected at a secondary over-blowing (the calcium carbonate The required injection amount was 1443 Kg. The primary overblowing time was calculated to be 360 Nm 3 × 21 counts (time unit).
[0021]
Based on the above calculation results, at the end of copper making (when the SO 2 concentration in the exhaust gas reached 4%), 759 Kg of silica was charged from the converter inlet, and almost simultaneously from the tuyere, 360 Nm 3 × 21 counts of air was blown, primary overblowing was performed, and the waste was discharged. Next, overblowing was performed by injecting 1443 kg of calcium carbonate from the tuyere, and the blowing was completed. The quality of the obtained crude copper was Pb = 0.30%, As = 0.12%, Sb = 0.14%. The operation results are shown in Table 1.
[0022]
[Example 2]
After accepting the river 115t produced in the flash furnace and blowing it in the same manner as in Example 1, the canning period was finished. The Pb, As and Sb grades of white river at that time were Pb = 4.0%, As = 0.3%, Sb = 0.6%, and the estimated amount of white river was 106t. From these data, the required amount of silica stone charged at the end of copper making was calculated as 815 kg, and the required amount of calcium carbonate injection during secondary overblowing was calculated as 1026 kg. The primary overblowing time was calculated to be 360 Nm 3 × 23 counts (time unit).
[0023]
Based on the above calculation results, at the end of copper making (when the SO 2 concentration in the exhaust gas reached 4%), 815 kg of silica was charged from the converter inlet and almost simultaneously from the tuyere 360 Nm 3 × 23 counts of air was blown, primary overblowing was performed, and the waste was discharged. Next, secondary blowing was performed with 1026 kg of calcium carbonate while blowing from the tuyere, and blowing was completed. The quality of the obtained crude copper was Pb = 0.11%, As = 0.09%, Sb = 0.10%. The results of this operation are also shown in Table 1.
[0024]
Example 3
After receiving 140t of the river produced in the flash furnace and blowing it in the same manner as in Example 1, the canning period was finished. The Pb, As, and Sb grades of white river at that time were Pb = 2.0%, As = 0.2%, Sb = 0.4%, and the estimated amount of white river was 117t. From these data, the required amount of silica stone to be charged at the end of copper making was calculated to be 504 kg, and the required injection amount of calcium carbonate in secondary overblowing was calculated to be 666 kg. The primary overblowing time was calculated to be 360 Nm 3 × 15 counts (time unit).
[0025]
Based on the above calculation results, at the end of copper making (when the SO 2 concentration in the exhaust gas reached 4%), 504 kg of silica was charged from the converter inlet and almost simultaneously from the tuyere 360 Nm 3 × The primary overblowing was performed with 15 counts of air blown, and the waste was discharged. Next, secondary blowing was performed with 666 kg of calcium carbonate while blowing from the tuyere, and blowing was completed. The quality of the obtained crude copper was Pb = 0.29%, As = 0.12%, Sb = 0.14%. The results of this operation are also shown in Table 1.
[0026]
[Comparative Example]
After receiving 11 7 t of the river produced in the flash furnace and blowing it in the same manner as in Example 1, the canning period was finished. The Pb, As and Sb grades of white river at that time were Pb = 2.5%, As = 0.35%, Sb = 0.65%. At the end of the copper making process, the copper making process was completed without charging the silica, and over blowing at 360 Nm 3 × 40 count was continued, and the blowing was completed without the injection of calcium carbonate. The quality of the obtained crude copper was Pb = 0.25%, As = 0.13%, Sb = 0.15%.
[0027]
[Table 1]
As can be seen from the results in Table 1, in the comparative example, the amount of copper oxide transferred to the slag was increased despite the fact that overblowing was performed with a load approximately 2-3 times that of Examples 1-3. The impurities are not removed so much. On the other hand, in each example, as a result of carrying out overblowing according to the content of impurities without excess or deficiency, it was found that high-grade crude copper sufficiently satisfying the crude copper control value could be efficiently produced. .
[0029]
【The invention's effect】
As described above, according to the present invention, Pb, As, and Sb, which adversely affect the electrolytic refining of copper, can be efficiently removed during the converter operation, which greatly contributes to the rationalization of copper smelting using sulfide ore as a raw material. Can contribute.
Claims (7)
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